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ExternalDisplayBrightness
A Mac app to control the brightness of external displays using keyboard shortcuts
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MonitorControl
🖥 Control your display's brightness & volume on your Mac as if it was a native Apple Display. Use Apple Keyboard keys or custom shortcuts. Shows the native macOS OSDs.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I use a tool called (funny enough) ExternalDisplayBrightness
I use monitorcontrol, works like a charm and even manage the sound output as well, oh and yes, it's free https://github.com/MonitorControl/MonitorControl
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.